/*
 * @Description:
 * @Version: 2.0
 * @Author: Xing
 * @Date: 2021-02-05 21:25:08
 * @LastEditors: Xing
 * @LastEditTime: 2021-02-05 21:43:39
 */
const hello = (name: string) => {
  return `hello ${name}`;
};
hello(100);

let arr: number[] = [1, 2, 3];
arr.push;
